GPPS
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General Purpose Polystyrene (GPPS)

 

Thermo-Physical Properties

PROPERTY UNIT VALUE / RANGE 
Melting Point °C180 - 260
Density g mL-1 1.04 - 1.05
Coefficient of Thermal Expansion x 10-5cm / (cm °C) 9.0 - 12.6
Heat Deflection Temperature, 0.5 MPa °C 77 - 97
Heat Deflection Temperature, 1.8 MPa annealed (unannealed) °C 78 - 98
Thermal ConductivityW / mK 0.35
Rockwell  Hardness, M Scale n/a 71 - 80
    
 

Mechanical Properties at 23 °C

PROPERTY UNITVALUE / RANGE
Tensile Strength, Yield at 23 C MPa
44 - 52.4
Tensile Strength, Break at 23 C MPa 47
Elongation, Yield % 2.0 - 3.0
Elongation, Break %  
Tensile Modulus at 23 CMPa 3100 - 3170
Flexural Strength, Yield MPa 62 - 100
Flexural Modulus  MPa 2900 - 3480
Compressive Strength MPa 
Izod Notched J/m  (kJ/m2) 16 - 21
Izod Unnotched J/m  
 

Electrical Properties

PROPERTY UNITVALUE / RANGE
Volume Resistivity
Ohm-cm > 6 x 1015
 Dielectric Strength V/mm x 104 2.1 - 3.5
Dielectric Constant @ 1 MHz n/a 2.20 - 2.35
Dissipation Factor @ 1 MHz n/a 0.0001 - 0.0005
 

Other Properties

PROPERTY UNITVALUE / RANGE
Processing Temperature
°C170 - 240
Linear Mold Shrinkage cm/cm 0.017
Continuous Service Temperature °C -73 - 82
Water Absorption, 24 hr. Immersion% > 0.01
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